我的python DHT11测温代码运行出错是如何解决，pythondht11,python运行出错Fi

我的python DHT11测温代码运行出错是如何解决，pythondht11,python运行出错Fi

python运行出错

File "./DHT11.py", line 20    for i in range(0,500):    ^IndentationError: unexpected indent

如何解决

以下是全部代码：

#!/usr/bin/pythonimport RPi.GPIO as GPIOimport timedef bin2dec(string_num):    return str(int(string_num, 2))    data = []    GPIO.setmode(GPIO.BCM)    GPIO.setup(4,GPIO.OUT)    GPIO.output(4,GPIO.HIGH)    time.sleep(0.025)    GPIO.output(4,GPIO.LOW)time.sleep(0.02)GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP)    for i in range(0,500):        data.append(GPIO.input(4))        bit_count = 0        tmp = 0        count = 0        HumidityBit = ""        TemperatureBit = ""        crc = ""        try:        while data[count] == 1:        tmp = 1        count = count + 1        for i in range(0, 32):            bit_count = 0            while data[count] == 0:            tmp = 1            count = count + 1            while data[count] == 1:            bit_count = bit_count + 1            count = count + 1            if bit_count > 3:            if i>=0 and i<8:            HumidityBit = HumidityBit + "1"            if i>=16 and i<24:            TemperatureBit = TemperatureBit + "1"            else:            if i>=0 and i<8:            HumidityBit = HumidityBit + "0"            if i>=16 and i<24:            TemperatureBit = TemperatureBit + "0"            except:    print "ERR_RANGE"exit(0)    try:    for i in range(0, 8):        bit_count = 0        while data[count] == 0:        tmp = 1        count = count + 1        while data[count] == 1:        bit_count = bit_count + 1        count = count + 1        if bit_count > 3:        crc = crc + "1"        else:        crc = crc + "0"        except:    print "ERR_RANGE"exit(0)    Humidity = bin2dec(HumidityBit)Temperature = bin2dec(TemperatureBit)    if int(Humidity) + int(Temperature) - int(bin2dec(crc)) == 0:    print Humidity    print Temperature    else:    print "ERR_CRC"

来自这个网址：
http://www.raspberrypi.org/forums/viewtopic.php?t=69427&p=505235

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